[people/ms/linux.git] / fs / btrfs / extent_io.h

/* SPDX-License-Identifier: GPL-2.0 */

#ifndef BTRFS_EXTENT_IO_H
#define BTRFS_EXTENT_IO_H

#include <linux/rbtree.h>
#include <linux/refcount.h>
#include "ulist.h"

/*
 * flags for bio submission. The high bits indicate the compression
 * type for this bio
 */
#define EXTENT_BIO_COMPRESSED 1
#define EXTENT_BIO_FLAG_SHIFT 16

enum {
	EXTENT_BUFFER_UPTODATE,
	EXTENT_BUFFER_DIRTY,
	EXTENT_BUFFER_CORRUPT,
	/* this got triggered by readahead */
	EXTENT_BUFFER_READAHEAD,
	EXTENT_BUFFER_TREE_REF,
	EXTENT_BUFFER_STALE,
	EXTENT_BUFFER_WRITEBACK,
	/* read IO error */
	EXTENT_BUFFER_READ_ERR,
	EXTENT_BUFFER_UNMAPPED,
	EXTENT_BUFFER_IN_TREE,
	/* write IO error */
	EXTENT_BUFFER_WRITE_ERR,
};

/* these are flags for __process_pages_contig */
#define PAGE_UNLOCK		(1 << 0)
#define PAGE_CLEAR_DIRTY	(1 << 1)
#define PAGE_SET_WRITEBACK	(1 << 2)
#define PAGE_END_WRITEBACK	(1 << 3)
#define PAGE_SET_PRIVATE2	(1 << 4)
#define PAGE_SET_ERROR		(1 << 5)
#define PAGE_LOCK		(1 << 6)

/*
 * page->private values.  Every page that is controlled by the extent
 * map has page->private set to one.
 */
#define EXTENT_PAGE_PRIVATE 1

/*
 * The extent buffer bitmap operations are done with byte granularity instead of
 * word granularity for two reasons:
 * 1. The bitmaps must be little-endian on disk.
 * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
 *    single word in a bitmap may straddle two pages in the extent buffer.
 */
#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
#define BITMAP_FIRST_BYTE_MASK(start) \
	((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
#define BITMAP_LAST_BYTE_MASK(nbits) \
	(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))

struct btrfs_root;
struct btrfs_inode;
struct btrfs_io_bio;
struct io_failure_record;
struct extent_io_tree;

typedef blk_status_t (extent_submit_bio_start_t)(void *private_data,
		struct bio *bio, u64 bio_offset);

struct extent_io_ops {
	/*
	 * The following callbacks must be always defined, the function
	 * pointer will be called unconditionally.
	 */
	blk_status_t (*submit_bio_hook)(struct inode *inode, struct bio *bio,
					int mirror_num, unsigned long bio_flags);
	int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
				    struct page *page, u64 start, u64 end,
				    int mirror);
};


#define INLINE_EXTENT_BUFFER_PAGES 16
#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
struct extent_buffer {
	u64 start;
	unsigned long len;
	unsigned long bflags;
	struct btrfs_fs_info *fs_info;
	spinlock_t refs_lock;
	atomic_t refs;
	atomic_t io_pages;
	int read_mirror;
	struct rcu_head rcu_head;
	pid_t lock_owner;

	int blocking_writers;
	atomic_t blocking_readers;
	bool lock_nested;
	/* >= 0 if eb belongs to a log tree, -1 otherwise */
	short log_index;

	/* protects write locks */
	rwlock_t lock;

	/* readers use lock_wq while they wait for the write
	 * lock holders to unlock
	 */
	wait_queue_head_t write_lock_wq;

	/* writers use read_lock_wq while they wait for readers
	 * to unlock
	 */
	wait_queue_head_t read_lock_wq;
	struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
#ifdef CONFIG_BTRFS_DEBUG
	int spinning_writers;
	atomic_t spinning_readers;
	atomic_t read_locks;
	int write_locks;
	struct list_head leak_list;
#endif
};

/*
 * Structure to record how many bytes and which ranges are set/cleared
 */
struct extent_changeset {
	/* How many bytes are set/cleared in this operation */
	unsigned int bytes_changed;

	/* Changed ranges */
	struct ulist range_changed;
};

static inline void extent_changeset_init(struct extent_changeset *changeset)
{
	changeset->bytes_changed = 0;
	ulist_init(&changeset->range_changed);
}

static inline struct extent_changeset *extent_changeset_alloc(void)
{
	struct extent_changeset *ret;

	ret = kmalloc(sizeof(*ret), GFP_KERNEL);
	if (!ret)
		return NULL;

	extent_changeset_init(ret);
	return ret;
}

static inline void extent_changeset_release(struct extent_changeset *changeset)
{
	if (!changeset)
		return;
	changeset->bytes_changed = 0;
	ulist_release(&changeset->range_changed);
}

static inline void extent_changeset_free(struct extent_changeset *changeset)
{
	if (!changeset)
		return;
	extent_changeset_release(changeset);
	kfree(changeset);
}

static inline void extent_set_compress_type(unsigned long *bio_flags,
					    int compress_type)
{
	*bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
}

static inline int extent_compress_type(unsigned long bio_flags)
{
	return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
}

struct extent_map_tree;

typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode,
					  struct page *page, size_t pg_offset,
					  u64 start, u64 len);

int try_release_extent_mapping(struct page *page, gfp_t mask);
int try_release_extent_buffer(struct page *page);

int extent_read_full_page(struct page *page, get_extent_t *get_extent,
			  int mirror_num);
int extent_write_full_page(struct page *page, struct writeback_control *wbc);
int extent_write_locked_range(struct inode *inode, u64 start, u64 end,
			      int mode);
int extent_writepages(struct address_space *mapping,
		      struct writeback_control *wbc);
int btree_write_cache_pages(struct address_space *mapping,
			    struct writeback_control *wbc);
int extent_readpages(struct address_space *mapping, struct list_head *pages,
		     unsigned nr_pages);
int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
		__u64 start, __u64 len);
void set_page_extent_mapped(struct page *page);

struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
					  u64 start);
struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
						  u64 start, unsigned long len);
struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
						u64 start);
struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
					 u64 start);
void free_extent_buffer(struct extent_buffer *eb);
void free_extent_buffer_stale(struct extent_buffer *eb);
#define WAIT_NONE	0
#define WAIT_COMPLETE	1
#define WAIT_PAGE_LOCK	2
int read_extent_buffer_pages(struct extent_buffer *eb, int wait,
			     int mirror_num);
void wait_on_extent_buffer_writeback(struct extent_buffer *eb);

static inline int num_extent_pages(const struct extent_buffer *eb)
{
	return (round_up(eb->start + eb->len, PAGE_SIZE) >> PAGE_SHIFT) -
	       (eb->start >> PAGE_SHIFT);
}

static inline int extent_buffer_uptodate(struct extent_buffer *eb)
{
	return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
}

int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
			 unsigned long start, unsigned long len);
void read_extent_buffer(const struct extent_buffer *eb, void *dst,
			unsigned long start,
			unsigned long len);
int read_extent_buffer_to_user(const struct extent_buffer *eb,
			       void __user *dst, unsigned long start,
			       unsigned long len);
void write_extent_buffer_fsid(struct extent_buffer *eb, const void *src);
void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,
		const void *src);
void write_extent_buffer(struct extent_buffer *eb, const void *src,
			 unsigned long start, unsigned long len);
void copy_extent_buffer_full(struct extent_buffer *dst,
			     struct extent_buffer *src);
void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
			unsigned long dst_offset, unsigned long src_offset,
			unsigned long len);
void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
			   unsigned long src_offset, unsigned long len);
void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
			   unsigned long src_offset, unsigned long len);
void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,
			   unsigned long len);
int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
			   unsigned long pos);
void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
			      unsigned long pos, unsigned long len);
void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
				unsigned long pos, unsigned long len);
void clear_extent_buffer_dirty(struct extent_buffer *eb);
bool set_extent_buffer_dirty(struct extent_buffer *eb);
void set_extent_buffer_uptodate(struct extent_buffer *eb);
void clear_extent_buffer_uptodate(struct extent_buffer *eb);
int extent_buffer_under_io(struct extent_buffer *eb);
int map_private_extent_buffer(const struct extent_buffer *eb,
			      unsigned long offset, unsigned long min_len,
			      char **map, unsigned long *map_start,
			      unsigned long *map_len);
void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
				  struct page *locked_page,
				  unsigned bits_to_clear,
				  unsigned long page_ops);
struct bio *btrfs_bio_alloc(u64 first_byte);
struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs);
struct bio *btrfs_bio_clone(struct bio *bio);
struct bio *btrfs_bio_clone_partial(struct bio *orig, int offset, int size);

struct btrfs_fs_info;
struct btrfs_inode;

int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
		      u64 length, u64 logical, struct page *page,
		      unsigned int pg_offset, int mirror_num);
void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
int btrfs_repair_eb_io_failure(struct extent_buffer *eb, int mirror_num);

/*
 * When IO fails, either with EIO or csum verification fails, we
 * try other mirrors that might have a good copy of the data.  This
 * io_failure_record is used to record state as we go through all the
 * mirrors.  If another mirror has good data, the page is set up to date
 * and things continue.  If a good mirror can't be found, the original
 * bio end_io callback is called to indicate things have failed.
 */
struct io_failure_record {
	struct page *page;
	u64 start;
	u64 len;
	u64 logical;
	unsigned long bio_flags;
	int this_mirror;
	int failed_mirror;
	int in_validation;
};


struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
				    struct io_failure_record *failrec,
				    struct page *page, int pg_offset, int icsum,
				    bio_end_io_t *endio_func, void *data);
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
bool find_lock_delalloc_range(struct inode *inode,
			     struct page *locked_page, u64 *start,
			     u64 *end);
#endif
struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
					       u64 start);

#ifdef CONFIG_BTRFS_DEBUG
void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
#else
#define btrfs_extent_buffer_leak_debug_check(fs_info)	do {} while (0)
#endif

#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
9888c340 DS	2
	3	#ifndef BTRFS_EXTENT_IO_H
	4	#define BTRFS_EXTENT_IO_H
d1310b2e CM	5
d1310b2e CM	6	#include <linux/rbtree.h>
b7ac31b7	7	#include <linux/refcount.h>
ac467772	8	#include "ulist.h"
d1310b2e	9
261507a0 LZ	10	/*
	11	* flags for bio submission. The high bits indicate the compression
	12	* type for this bio
	13	*/
c8b97818	14	#define EXTENT_BIO_COMPRESSED 1
261507a0	15	#define EXTENT_BIO_FLAG_SHIFT 16
c8b97818	16
80cb3836 DS	17	enum {
	18	EXTENT_BUFFER_UPTODATE,
	19	EXTENT_BUFFER_DIRTY,
	20	EXTENT_BUFFER_CORRUPT,
	21	/* this got triggered by readahead */
	22	EXTENT_BUFFER_READAHEAD,
	23	EXTENT_BUFFER_TREE_REF,
	24	EXTENT_BUFFER_STALE,
	25	EXTENT_BUFFER_WRITEBACK,
	26	/* read IO error */
	27	EXTENT_BUFFER_READ_ERR,
	28	EXTENT_BUFFER_UNMAPPED,
	29	EXTENT_BUFFER_IN_TREE,
	30	/* write IO error */
	31	EXTENT_BUFFER_WRITE_ERR,
	32	};
b4ce94de	33
da2c7009	34	/* these are flags for __process_pages_contig */
c2790a2e JB	35	#define PAGE_UNLOCK (1 << 0)
	36	#define PAGE_CLEAR_DIRTY (1 << 1)
	37	#define PAGE_SET_WRITEBACK (1 << 2)
	38	#define PAGE_END_WRITEBACK (1 << 3)
	39	#define PAGE_SET_PRIVATE2 (1 << 4)
704de49d	40	#define PAGE_SET_ERROR (1 << 5)
da2c7009	41	#define PAGE_LOCK (1 << 6)
a791e35e	42
d1310b2e CM	43	/*
	44	* page->private values. Every page that is controlled by the extent
	45	* map has page->private set to one.
	46	*/
	47	#define EXTENT_PAGE_PRIVATE 1
d1310b2e	48
2fe1d551 OS	49	/*
	50	* The extent buffer bitmap operations are done with byte granularity instead of
	51	* word granularity for two reasons:
	52	* 1. The bitmaps must be little-endian on disk.
	53	* 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
	54	* single word in a bitmap may straddle two pages in the extent buffer.
	55	*/
	56	#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
	57	#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
	58	#define BITMAP_FIRST_BYTE_MASK(start) \
	59	((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
	60	#define BITMAP_LAST_BYTE_MASK(nbits) \
	61	(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
	62
ea466794	63	struct btrfs_root;
6fc0ef68	64	struct btrfs_inode;
facc8a22	65	struct btrfs_io_bio;
47dc196a	66	struct io_failure_record;
9c7d3a54	67	struct extent_io_tree;
a758781d DS	68
a758781d DS	69	typedef blk_status_t (extent_submit_bio_start_t)(void *private_data,
d0779291	70	struct bio *bio, u64 bio_offset);
a758781d	71
d1310b2e	72	struct extent_io_ops {
4d53dddb	73	/*
52042d8e	74	* The following callbacks must be always defined, the function
4d53dddb DS	75	* pointer will be called unconditionally.
4d53dddb DS	76	*/
a56b1c7b	77	blk_status_t (submit_bio_hook)(struct inode inode, struct bio *bio,
50489a57	78	int mirror_num, unsigned long bio_flags);
4d53dddb DS	79	int (readpage_end_io_hook)(struct btrfs_io_bio io_bio, u64 phy_offset,
	80	struct page *page, u64 start, u64 end,
	81	int mirror);
d1310b2e CM	82	};
d1310b2e CM	83
d1310b2e	84
727011e0	85	#define INLINE_EXTENT_BUFFER_PAGES 16
09cbfeaf	86	#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
d1310b2e CM	87	struct extent_buffer {
	88	u64 start;
	89	unsigned long len;
b4ce94de	90	unsigned long bflags;
f28491e0	91	struct btrfs_fs_info *fs_info;
3083ee2e	92	spinlock_t refs_lock;
727011e0	93	atomic_t refs;
0b32f4bb	94	atomic_t io_pages;
5cf1ab56	95	int read_mirror;
19fe0a8b	96	struct rcu_head rcu_head;
5b25f70f	97	pid_t lock_owner;
b4ce94de	98
06297d8c	99	int blocking_writers;
bd681513	100	atomic_t blocking_readers;
ed1b4ed7	101	bool lock_nested;
656f30db FM	102	/* >= 0 if eb belongs to a log tree, -1 otherwise */
656f30db FM	103	short log_index;
bd681513 CM	104
	105	/* protects write locks */
	106	rwlock_t lock;
	107
	108	/* readers use lock_wq while they wait for the write
	109	* lock holders to unlock
	110	*/
	111	wait_queue_head_t write_lock_wq;
b4ce94de	112
bd681513 CM	113	/* writers use read_lock_wq while they wait for readers
bd681513 CM	114	* to unlock
b4ce94de	115	*/
bd681513	116	wait_queue_head_t read_lock_wq;
b8dae313	117	struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
6d49ba1b	118	#ifdef CONFIG_BTRFS_DEBUG
f3dc24c5	119	int spinning_writers;
afd495a8	120	atomic_t spinning_readers;
5c9c799a	121	atomic_t read_locks;
00801ae4	122	int write_locks;
6d49ba1b ES	123	struct list_head leak_list;
6d49ba1b ES	124	#endif
d1310b2e CM	125	};
d1310b2e CM	126
ac467772 QW	127	/*
	128	* Structure to record how many bytes and which ranges are set/cleared
	129	*/
	130	struct extent_changeset {
	131	/* How many bytes are set/cleared in this operation */
7bc329c1	132	unsigned int bytes_changed;
ac467772 QW	133
ac467772 QW	134	/* Changed ranges */
53d32359	135	struct ulist range_changed;
ac467772 QW	136	};
ac467772 QW	137
364ecf36 QW	138	static inline void extent_changeset_init(struct extent_changeset *changeset)
	139	{
	140	changeset->bytes_changed = 0;
	141	ulist_init(&changeset->range_changed);
	142	}
	143
	144	static inline struct extent_changeset *extent_changeset_alloc(void)
	145	{
	146	struct extent_changeset *ret;
	147
	148	ret = kmalloc(sizeof(*ret), GFP_KERNEL);
	149	if (!ret)
	150	return NULL;
	151
	152	extent_changeset_init(ret);
	153	return ret;
	154	}
	155
	156	static inline void extent_changeset_release(struct extent_changeset *changeset)
	157	{
	158	if (!changeset)
	159	return;
	160	changeset->bytes_changed = 0;
	161	ulist_release(&changeset->range_changed);
	162	}
	163
	164	static inline void extent_changeset_free(struct extent_changeset *changeset)
	165	{
	166	if (!changeset)
	167	return;
	168	extent_changeset_release(changeset);
	169	kfree(changeset);
	170	}
	171
261507a0 LZ	172	static inline void extent_set_compress_type(unsigned long *bio_flags,
	173	int compress_type)
	174	{
	175	*bio_flags \|= compress_type << EXTENT_BIO_FLAG_SHIFT;
	176	}
	177
	178	static inline int extent_compress_type(unsigned long bio_flags)
	179	{
	180	return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
	181	}
	182
d1310b2e CM	183	struct extent_map_tree;
d1310b2e CM	184
fc4f21b1	185	typedef struct extent_map (get_extent_t)(struct btrfs_inode inode,
39b07b5d OS	186	struct page *page, size_t pg_offset,
39b07b5d OS	187	u64 start, u64 len);
d1310b2e	188
477a30ba	189	int try_release_extent_mapping(struct page *page, gfp_t mask);
f7a52a40	190	int try_release_extent_buffer(struct page *page);
cd716d8f	191
71ad38b4 DS	192	int extent_read_full_page(struct page page, get_extent_t get_extent,
71ad38b4 DS	193	int mirror_num);
0a9b0e53	194	int extent_write_full_page(struct page page, struct writeback_control wbc);
5e3ee236	195	int extent_write_locked_range(struct inode *inode, u64 start, u64 end,
771ed689	196	int mode);
8ae225a8	197	int extent_writepages(struct address_space *mapping,
d1310b2e	198	struct writeback_control *wbc);
0b32f4bb JB	199	int btree_write_cache_pages(struct address_space *mapping,
0b32f4bb JB	200	struct writeback_control *wbc);
2a3ff0ad NB	201	int extent_readpages(struct address_space mapping, struct list_head pages,
2a3ff0ad NB	202	unsigned nr_pages);
1506fcc8	203	int extent_fiemap(struct inode inode, struct fiemap_extent_info fieinfo,
2135fb9b	204	__u64 start, __u64 len);
d1310b2e CM	205	void set_page_extent_mapped(struct page *page);
d1310b2e CM	206
f28491e0	207	struct extent_buffer alloc_extent_buffer(struct btrfs_fs_info fs_info,
ce3e6984	208	u64 start);
0f331229 OS	209	struct extent_buffer __alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
0f331229 OS	210	u64 start, unsigned long len);
3f556f78	211	struct extent_buffer alloc_dummy_extent_buffer(struct btrfs_fs_info fs_info,
da17066c	212	u64 start);
815a51c7	213	struct extent_buffer btrfs_clone_extent_buffer(struct extent_buffer src);
f28491e0	214	struct extent_buffer find_extent_buffer(struct btrfs_fs_info fs_info,
452c75c3	215	u64 start);
d1310b2e	216	void free_extent_buffer(struct extent_buffer *eb);
3083ee2e	217	void free_extent_buffer_stale(struct extent_buffer *eb);
bb82ab88 AJ	218	#define WAIT_NONE 0
	219	#define WAIT_COMPLETE 1
	220	#define WAIT_PAGE_LOCK 2
c2ccfbc6	221	int read_extent_buffer_pages(struct extent_buffer *eb, int wait,
6af49dbd	222	int mirror_num);
fd8b2b61	223	void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
479ed9ab	224
cc5e31a4	225	static inline int num_extent_pages(const struct extent_buffer *eb)
479ed9ab	226	{
8791d432 DS	227	return (round_up(eb->start + eb->len, PAGE_SIZE) >> PAGE_SHIFT) -
8791d432 DS	228	(eb->start >> PAGE_SHIFT);
479ed9ab RD	229	}
479ed9ab RD	230
ba020491 AJ	231	static inline int extent_buffer_uptodate(struct extent_buffer *eb)
	232	{
	233	return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
	234	}
	235
1cbb1f45 JM	236	int memcmp_extent_buffer(const struct extent_buffer eb, const void ptrv,
	237	unsigned long start, unsigned long len);
	238	void read_extent_buffer(const struct extent_buffer eb, void dst,
d1310b2e CM	239	unsigned long start,
d1310b2e CM	240	unsigned long len);
1cbb1f45 JM	241	int read_extent_buffer_to_user(const struct extent_buffer *eb,
1cbb1f45 JM	242	void __user *dst, unsigned long start,
550ac1d8	243	unsigned long len);
f157bf76 DS	244	void write_extent_buffer_fsid(struct extent_buffer eb, const void src);
	245	void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,
	246	const void *src);
d1310b2e CM	247	void write_extent_buffer(struct extent_buffer eb, const void src,
d1310b2e CM	248	unsigned long start, unsigned long len);
58e8012c DS	249	void copy_extent_buffer_full(struct extent_buffer *dst,
58e8012c DS	250	struct extent_buffer *src);
d1310b2e CM	251	void copy_extent_buffer(struct extent_buffer dst, struct extent_buffer src,
	252	unsigned long dst_offset, unsigned long src_offset,
	253	unsigned long len);
	254	void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	255	unsigned long src_offset, unsigned long len);
	256	void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
	257	unsigned long src_offset, unsigned long len);
b159fa28 DS	258	void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,
b159fa28 DS	259	unsigned long len);
3e1e8bb7 OS	260	int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
	261	unsigned long pos);
	262	void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
	263	unsigned long pos, unsigned long len);
	264	void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
	265	unsigned long pos, unsigned long len);
1d4284bd	266	void clear_extent_buffer_dirty(struct extent_buffer *eb);
abb57ef3	267	bool set_extent_buffer_dirty(struct extent_buffer *eb);
09c25a8c	268	void set_extent_buffer_uptodate(struct extent_buffer *eb);
69ba3927	269	void clear_extent_buffer_uptodate(struct extent_buffer *eb);
a26e8c9f	270	int extent_buffer_under_io(struct extent_buffer *eb);
1cbb1f45 JM	271	int map_private_extent_buffer(const struct extent_buffer *eb,
	272	unsigned long offset, unsigned long min_len,
	273	char *map, unsigned long map_start,
	274	unsigned long *map_len);
bd1fa4f0	275	void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
f6311572	276	void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
a9d93e17	277	void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
74e9194a NB	278	struct page *locked_page,
	279	unsigned bits_to_clear,
	280	unsigned long page_ops);
e749af44	281	struct bio *btrfs_bio_alloc(u64 first_byte);
c5e4c3d7	282	struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs);
8b6c1d56	283	struct bio btrfs_bio_clone(struct bio bio);
e477094f	284	struct bio btrfs_bio_clone_partial(struct bio orig, int offset, int size);
4a54c8c1	285
3ec706c8	286	struct btrfs_fs_info;
9d4f7f8a	287	struct btrfs_inode;
4a54c8c1	288
6ec656bc JB	289	int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
	290	u64 length, u64 logical, struct page *page,
	291	unsigned int pg_offset, int mirror_num);
b5227c07	292	void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
20a1fbf9	293	int btrfs_repair_eb_io_failure(struct extent_buffer *eb, int mirror_num);
2fe6303e MX	294
	295	/*
	296	* When IO fails, either with EIO or csum verification fails, we
	297	* try other mirrors that might have a good copy of the data. This
	298	* io_failure_record is used to record state as we go through all the
	299	* mirrors. If another mirror has good data, the page is set up to date
	300	* and things continue. If a good mirror can't be found, the original
	301	* bio end_io callback is called to indicate things have failed.
	302	*/
	303	struct io_failure_record {
	304	struct page *page;
	305	u64 start;
	306	u64 len;
	307	u64 logical;
	308	unsigned long bio_flags;
	309	int this_mirror;
	310	int failed_mirror;
	311	int in_validation;
	312	};
	313
4ac1f4ac	314
2fe6303e MX	315	struct bio btrfs_create_repair_bio(struct inode inode, struct bio *failed_bio,
	316	struct io_failure_record *failrec,
	317	struct page *page, int pg_offset, int icsum,
8b110e39	318	bio_end_io_t endio_func, void data);
294e30fe	319	#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
9978059b	320	bool find_lock_delalloc_range(struct inode *inode,
ce9f967f JT	321	struct page locked_page, u64 start,
ce9f967f JT	322	u64 *end);
0d4cf4e6	323	#endif
faa2dbf0	324	struct extent_buffer alloc_test_extent_buffer(struct btrfs_fs_info fs_info,
da17066c	325	u64 start);
3fd63727 JB	326
	327	#ifdef CONFIG_BTRFS_DEBUG
	328	void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
	329	#else
	330	#define btrfs_extent_buffer_leak_debug_check(fs_info) do {} while (0)
	331	#endif
	332
294e30fe	333	#endif